US2016101487A1PendingUtilityA1

Spot welding electrode

39
Assignee: TOYOTA MOTOR CO LTDPriority: Oct 10, 2014Filed: Oct 1, 2015Published: Apr 14, 2016
Est. expiryOct 10, 2034(~8.2 yrs left)· nominal 20-yr term from priority
Inventors:Shuhei OguraKazuyuki Ogusu
B23K 11/30B23K 35/0205B23K 35/222
39
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Claims

Abstract

A spot welding electrode includes a copper alloy, and a sintered tungsten alloy disposed in a tip portion of the spot welding electrode, the tip portion of the spot welding electrode being brought into contact with an object to be welded. The sintered tungsten alloy is connected only at a single flat surface to the copper alloy. A thermal conductivity of the spot welding electrode is within a range from 60 W/mK to 120 W/mK.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A spot welding electrode comprising:
 a copper alloy; and   a sintered tungsten alloy disposed in a tip portion of the spot welding electrode, the tip portion of the spot welding electrode being brought into contact with an object to be welded, wherein   the sintered tungsten alloy is connected only at a single flat surface to the copper alloy, and   a thermal conductivity of the spot welding electrode is within a range from 60 W/mK to 120 W/mK.   
     
     
         2 . The spot welding electrode according to  claim 1 , wherein a mean particle diameter of the sintered tungsten alloy is 3 μm or less. 
     
     
         3 . The spot welding electrode according to  claim 1 , wherein a part of the tip portion of the spot welding electrode, the part being brought into contact with the object to be welded, has a continuous curved surface with no corner. 
     
     
         4 . The spot welding electrode according to  claim 1 , wherein the copper alloy contains chromium. 
     
     
         5 . The spot welding electrode according to  claim 1 , wherein the sintered tungsten alloy contains carbon. 
     
     
         6 . A method of spot welding comprising:
 using the spot welding electrode according to  claim 1  for spot welding of an aluminum alloy material.

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